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Features

Boring Machine

Paddle Shafts for Pacific Mail Steamers

The Metropolitan Museum of Art

The New York State Reward for Improvements in Canal Navigation

Burning Water as Fuel

Are the Planets Inhabited?

The Employment of Women

Army and Navy Patents

Arsenic Colors

Free Mail Privileges Ended

The Boston Fire Commissioners' Report

The System of Snow Protection on the Union Pacific Railroad

Mixing Cylinder for Concrete

The Pantagraph

The Chemical Discoveries by the Spectroscope

The Lost Arts

Lynn's Anti-Freezing Railroad Tank Valve and Feeder

Steam Filter and Condenser

Pneumatic Gun Carriage and Elevator

Patent Office Decisions

Decisions of the Courts

United States Circuit Court—Southern District of New York.

Recent American and Foreign Patents

Answers to Correspondents

Communications Received

Departments

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    Correspondence

  • Notes and Queries

  • Business and Personal

  • Index of Inventions

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February 15, 1873

Complex Causes. Alternative Solutions.